Using these OLM window rain guards is easy. First, make sure the surface where you'll attach the guards is clean. You can use a normal car cleaner to wipe it down. Then, take the guards out of the package and peel off the backing of the double - sided 3M adhesive. Press the guards firmly onto the window frame. That's it! As for precautions, avoid installing the guards in extremely cold or hot weather as it might affect the adhesive. When it comes to maintenance, you can clean the guards with a mild soap and water solution. Just use a soft cloth to gently wipe them down. Don't use abrasive cleaners as they can scratch the smoked finish.